Once you decide to use BGP as the routing protocol in your DMVPN network , you face a few more design choices: Should you use IBGP or EBGP? ...
Showing posts with label BGP. Show all posts
Showing posts with label BGP. Show all posts
Programming the Network – A Few Guidelines
Even though I questioned the wisdom of writing your own network programming applications , I know I would immediately jump into those waters...
Use ThousandEyes to Implement IP SLA on Steroids
You did read my blog post on ThousandEyes , didn’t you? What I forgot to mention was that they have this cool API that allows you to extract...
IBGP Migrations Can Generate Forwarding Loops
A group of researches presented an “interesting” result @ IETF 87: migrating from IBGP full mesh to IBGP reflectors can introduce temporary ...
Exception Routing with BGP: SDN Done Right
One of the holy grails of data center SDN evangelists is controller-driven traffic engineering (throwing more leaf-and-spine bandwidth at th...
Can BGP Route Reflectors Really Generate Forwarding Loops?
TL&DR Summary: Yes (if you’re clumsy enough). A while ago I read Impact of Graceful IGP Operations on BGP – an article that described h...
Combining DMVPN with Existing MPLS/VPN Network
One of the Expert Express sessions focused on an MPLS/VPN-based WAN network using OSPF as the routing protocol. The customer wanted to add ...
Routing Protocols on NSX Edge Services Router
VMware gave me early access to NSX hands-on lab a few days prior to VMworld 2013. The lab was meant to demonstrate the basics of NSX, from ...
More private AS numbers
Have you ever tried to implement a large-scale DMVPN or MPLS/VPN network using BGP as the routing protocol? If you tried to stitch more than...
EIBGP Load Balancing
The next small step in my MPLS/VPN update project : EIBGP load balancing – why is it useful, how it works, why can’t you use it without full...
BGP Best External Explained
Loads of niche features got crammed into (MP)BGP and MPLS since I wrote my MPLS books , most of them trying to tweak BGP (a scalable and rea...
Load Balancing Across Multiple MPLS/VPN Providers
Arnold sent me an interesting challenge: he’s using two MPLS/VPN providers, with most sites being connected to both providers. He’d like to ...
Predicting the IPv6 BGP table size
One of my readers sent me an interesting question: Are you aware of any studies looking at the effectiveness of IPv6 address allocation poli...
WAN Routing in Data Centers with Layer-2 DCI
A while ago I got an interesting question: Let's say that due to circumstances outside of your control, you must have stretched data cen...
Internet-in-a-VRF and LFIB explosion
Matthew Stone encountered another unintended consequence of full Internet routing in a VRF design: the TCAM on his 6500 was 80% utilized e...
BGP Security draft adopted as IETF workgroup document
We published the first draft of the BGP Operations and Security document almost a year ago . In the meantime, the authors and Merike Kaeo p...
BGP Convergence Optimization
I’m exposed to an incredible variety of topics in my ExpertExpress engagements , but there are always a few recurring themes, one of them be...
Setting NO-EXPORT BGP Community
A reader of my blog experienced problems setting no-export BGP community . Here’s a quick how-to guide (if you’re new to BGP, you might want...
Beware of the pre-bestpath cost extended BGP community
One of my readers sent me an interesting problem a few days ago: the BGP process running on a PE-router in his MPLS/VPN network preferred an...
Is it safe to run Internet in a VRF?
During the February Packet Party someone asked the evergreen question: “ Is it safe to run Internet services in a VR F? ” and my off-the-cu...